Lifting-jack.



PATBNTED MAR. s, 1908. G. P. PREED. LIFTING JACK. 4 APPLICATION FILED MAR. 29, 1906.

3 SHEETS-SHEET 1.

UJI.

WITNESSES (MW. K w45 dick/Mug No. 880,874. PATENTED MAR. s, 1908. G. P. FRBED. l

LIFTING JACK.

APPLICATION FILED MAR. 29, 1906.

3 SHEETS-SHEET 2.

witnesses Nofssom.

G. R FREBD. PATENTED MAR. 3, 1908,

LIPTING JACK.

APPLICATION PILEDMAR. 29, 1906.

' 3 SHEETS-SHEET 3.

W erw' 4 i enligne rrrrnn'r oiirioii.

UEGRGE lf. Fltli'il), Ol ALLEGHENY, PENNSYLVANIA, ASSIGNOR TO TllE DUFF MANU- i'i".iC'l`Ultli`{(i COMPANY, OF PITTSBURG, PENNSYLVANIA, A' CORPORATION OFv PENN- stun-irri.

LIFTING-J'ACK.

Patented March 3, 1908.

`pplicatioii led March 29. 1906. Serial No. 308.680.

'To all Iwhom it may concern:

Be it known that l, GEORGE F. Fnnnn, of Allegheny, Allegheny County, Pennsylvania,A have invented n new and useful Lifting-Jack, of which the following it full, Clear, and exact description, reference being had to the accompanying drawings, forming part of this speriiiention, in whieh- Figures i and 2 are side elevations of a. lifting jack ,embodying my invention, taken from opposite sides, the actuating lever being broken away; Fig. 3 is it detail view of the bearings for the actuating lever; and Fig. 4L is zi side elevatifui, showing a modified form ily invention has relation to lifting jacks of that elnss commonly known ratchetl le ver.

With these objects in. view, my invention consists in the novel eoiistruetion, arrangement, and Combination of parts, all substantially hereinafter described :ind pointed outin the appended elnims.

ln the drawings, 2 desigimtes the frame of the jack, nud I the ini-losing easing for the ger. ing and other operativeparts.

L. desiginites the usual lifting bnr which is mounted for vertical movement iii guides 5 of the. frame 2 rind whioh is actuated in the 'forni of jerk shown in Figs. l and 2, by means of the pinion 6 on the shaft 7 ol the gear wheel 8. i. ".3 the lifting pnwl, which will also he hereinafter referred to ns the short pziwl, sind i() is the holding or retaining pnwl, whieli will also be referred to hereiiml'tei' iis the long piiwl. rllhe pziwl E) is pivotiillv eoiiiierted to ythe short. nrm ol' the actuating livrer El it il, while the long pnwl l() is pizoted in the. i'rnme 2 on the shalt or pin Athrough the medium of' the pinion 6.

l0, both pa'wls being arranged to engage the teeth of the gear wheel S iii the manner hereinafter described.

l2 is a. spring which is eoiineeted nt one end to the pawl 9 and at itsopposite end to :t in 12aL of i shifting device, or lowering )lock 13 which is arranged to be moved on a guide 13 horizontally towards and away from the pawl 9 by nieiinsol' :in eeeentrie 14, pivoted at l5 to the frame 2. i6 is a. similar spring which is eonneoted at one end to'a pin or projection of the pnwl l() and at its opposite end to ii dog 17 pivoted to the frame 2 .nt 18, and having it rei-.ess Il) which is engaged hy :t linger 2() of the lowering block 13.

2l is it enni or guide, whose inner curved face is engaged hy :i projeetion 22 ol" the awl 9 for the purpose ol' loreing siiid pnwl inwardly into engagement with the teeth ofthe gear wheel S, in the manner hereinafter described. This i'zim guide is movably connected with the trame 2 by the pin or serew 223, and zilsQi-esis upon :i pin or projection 24, its upper end being engaged by n spring 2,). The short :irm ol the operating lever l] is connected with the pnwl l() through the iuediuni of n rod 26, slotted link or yoke 27, and spring 2H, the spring heilig sented between the nul, 29 :it the upper ond of the i'od 26 :ind the bottom olI the lslot in the link or yoke, through which the upper eiid portion o'l'A the rod 26 loosely extends. 'l`he oi'iera-tion of raising :i loud consists in actuating the socket or operating lever l]7 thereby' causing the short pziwl J to engage the teeth ot the geur wheel S :ind move sn'id geni' wheel, and thereby the lifting har 4 This operation is etl'eeted, ofcourse, by the downward movement ot' the lover l l the long pztwl i() holding the, loiid while the lover is boing raised. The operation in this respeetis siibstantiolly siiiuliir to that of other lifting jacks.

[n lowering the loaded`jz1ek, the lifting blork or shifting device 123, which, in raising lOO Springs under compr-lessico. ,Vith the parte* inilth position shown in Figs. und 2, tho load is mold by the engagl-fment of the pawl 'fl l) with the gear whcol S, and as the loud if:

.- taken hy this pziwl, the pam/l 9 is thrown out o'f'engngi-nunt by; means ot tho spring 12, and is hold out of enggug'nicnt whih tho lover is living' raisid. AS thev .lover is loworcd. tho )ti-wl 9 .is rinsed und is guidod hy thix mun lQurioniaoo 3l into ongug'enwni with tho noxt tooth on the goin', tho Spring l2 keeping' it gulli oientlyhwuy iron! the wheel to (flour tha;y point of thi.l tooth. As soon as tho howl J tithe/S tho loud, tho puwl lli is thrown out oi" loengugoinout hy thv Spring' lh. 'As tho l/.wvir

gli ynow rufiSod., tho loud it` iiztwl. The puwl l0 is hooitiwi lo; vod into ongz'igenient with tho truth o'l tho izmir for th-oi'iui'poo ol2 tzihinglhv loud w "n tho opor .ating lover is :it its lowhsl point hy moons ot `:tho:descriliod Qoiin-oction with thc operating 'lefvor; tht is to Saly, :1S the lovin' l l is raised, the rod 26 is drawn downwiu'dly through tho yoke or link 27 until 'the nui El @iig-gos tho bspL-ing Suid spring thon pulls tho puwl 1.0 .into engagement with tho geur whofl :it u

l ohlznn un uutonnltnf step-hy-siop lowering 'i .-coi'tnin point in thil stroke ol' tho lover. This Hspring 28 also 'forms u. lost motion vonnoviion v A-fwliich porinits further lnovQnn-nt ol" they rod 3Gy Qlfiitor tho imwl l() nmlios ilu virrugouiont. l Whon the Short ymwl ll is 'lhrown out' ol" onf gzigemont'hy tho spring .13 und tho lovvr moved dowuwzirdly, the rod. lo YSlides i'roely 1' in, the linli 27, so thu'.. :is `won us; ihn puwl i.) again tiiltL-S tho loud ihoro is sind@ onongh ho i Ivtwoon tho underside ol' tho nut if) und tho spring' 28 to permit tho puwl lll to hv thrown Onto'th engagement hy 'tho pring 'lli wilfhmit any interforenco.

40 it lwill ho notod thv-.t they springs l2 und lli vare vory light spriiigs, mi they how 'no work 'nto'do beyond moving 'tho uziwlu. und this; isi .'nO't .dono until thu lood hm; hoon outirolv taken olli* 'tho powl which is to ho moved.

45,1%@ operations just `desorilx-,d are ropmtted zit @mth Stroke' ol." tho levier l l., thorohy ojl'iooti 'ing' n Stop-by-ijtcp loworing ot the lood.

As fthovo noted, in tho noi-nml uso ot the 'jack as o liitingr jack, they shifting device or ol'bloclt 12:3 'is moved to tho lett hy ha!" f 'tion of tho eccentric 14, thoiohy' @loro j "1.-: )ring l) under tension, and also actuating the dog 17 which puts tho spring' 16 under j tension, so that said springs oct to nm'nnilly 55, hold their rospcctive pnwls in ougnging position.- My inveition is also iiloplicahh: to lii'ting jacks in which the lifting limi' is actuated 'directly by tho ongugonmnt oi thev puwls in- --stoudof through tho nicdiuin of gearing.

GOThifs 'forni oi tho invonliiou is illustrated in Fig, fi, in which tho lifting' har 1, is shown as provided with tooth 4l which mi directly ongaged by tho puwls ..ll und 10" which corrosmnd. rcspotivolv with tho pziwls G :uid 1.0 of

t 1e form :Ls inst alosvrihod.. The springs 12" ,ing puwl und Samar@ and i6 are lao 'like the Springs i2 and 16 with th@v oxcrptioi'i that the dog I7 is omitted, und tho springr 12"L is connected directly to tho shitting dovim oi' hlock 13u. The action of the puwls upon. the toothvd har 4 is'fin all rvsulx-is siniilur 'to their action on tho gem' whool in tho forni first descrihei'l.

'lho operating' lover li is secured tothe shul't Il() which is pivotully mounted in the 'lrunw 2, in thv hurihings l (Fig. Z3). These hushing'.`4 wmu' rapidly in uso und require frcqncnt rncwul. To l'zufilituto `weh renewal, I urrnnfm lhlni :is shown in Fig. 3, wherein thoy :uiinsortid iut-o tho traino-arms 2 from thu. ontw" sidvs ot .said urnis und :1ro held against turningr hy unions o'l` lugs or projeciiono 2&2, whivh virgule i'cffussos in the immo lim-sos i". i i;i l;l..'vn\ ent ole the hearings hy initii'nrd nioximlni is orovvnlod by means of ssrgwws oi' pluri l. Khun it i:-' dosired to renow ihofw hushii lhiu run. ho rondily dono without disuiiiulwring tho junk by removing tho pins or arrows Iii) und thon rmuoving the huShurrr; und inserting now ones in their plone. Y

Tho admiring-'wi ol my invontion whereby 'oporzitiii'ig devices und in. the facility with which my worn or detentive part may bo i'zidily ronewod or .rapida-zd.

Variouschanges may he made in the de tails of construction und,urrungemont 0i' theA various parts witlmut doparting from the spirit and scopo oi my invent-ion, since llfhiitclminisz-A i l. ln si lifting jack, an operating lover, a .lifting [mwl actuated therohy, iholding' mwl und u iii-einher connecting Suid lovor und the 'l holding oziwl for forcing tho powl into Working poi-litimi wlwn the 'idoli is operated t0 lowor thoy loud ,'ho @nulmeting member 'for tho holding' pziwl being independent of the .moans lwhich forro the lifting pnwl linto its engaging; position Substantially as described.

in u lifting ja on actuating laver, a. lifting; mwl, o, holding pawl, spring oon.-

tin.;Y mid s'f'iring; under either Qompression or tension, und n connection between said holdthc lcvvr; substantially as desrrihod.

3'. in u. lifting jack, a lifting pawl, a hold ingf mwl, :i separate spring for euch of said piiw s, und means, for putting' Suid spring` under uithor compression or tension; snh- Stuntiully ns dosorihed.

4. vln n lil'liugl` jack, u lifting-paid, iholding puwl, wpurute springs lt'or Said puwlsv and n 0 7. .ln a` lifting incl-.

5 holding pnwl pivoted to the freine of the 'ack a. s )ring arranged to force said nawl out J Y r3 h i of operative position when the load is he'ing lowered, -and a connection between the lever y and the pawl arranged to force said pawl into y operative position et predetermined tnnes;`1

substantie. ly as described.

6. ln a lifting jack, an zii-touting lever7 a lifting pnwl carried thereby, n holding pawl7 an operating oonneution between the lever and the holding' pnwl, separate springs for the two powlsJ :1nd a inovahle devine ar ranged to put the springs under either coinpression or tension; suhstantially :is le scribed.

nu aetuning lever, n. lifting pnwl carried thereby, a rain arranged to force said pziwl into engaging position, said f earn lntvingn vielding eounei-.tion with the javi( frame; substantially as described.

8. ln a. single-aetiug lifting jarli, a pair of alternntely-ating pawls arranged to successively tnlce the load iu hoth the raising -and the lowering operation of tho jaek, independent springs for the said pa.\\'l.s, end

i independent nieans for 'forcingsaid pawls into engaging positions in hoth raising and i l l l l l r lowering movements, whereby the engaging notion of each pewl is effected independentlT of the engaging action of the other pawl; substantially as described.

9. in a. single-acting j'aek, an operating lever, a lifting pawl carried by the lever, a holding pawl pivoted to the frame, 4e member connecting the holding pew]l to the' lever and noting to pull the pawl into engaging position in the lowering action of the jaek, a spring for moving the pawl out of'ehgaging position during the lowering operation, and independent moans for moving' the lifting pawl into and out of engaging positions; substantially as described.

10. ln a lifting jack, an operating lever, n holding pawl, a. lifting pawl, e connection between the holding pawl and the lever for moving said pawl into engaging position during the lowering ot the load, and a Spring fonnioving the lsaid pawl out of engaging position during the lowering of the loadl said Conneetion and spring being arranged to operate indepeinlentlyv of the lifting paul; su bstnntinll)T as deserihed. l

ln testimony whereof l have hereunto set'y my hond.

GEORGE F. liRlClGD.

VitIiesses:

JouN Mullin, H. M. (`on\\'1N. 

